This is a featured picture on Wikimedia Commons (Featured pictures) and is considered one of the finest images. See its nomination here.  This is a featured picture on the English language Wikipedia (Featured pictures) and is considered one of the finest images. See its nomination here. If you have an image of similar quality that can be published under a suitable copyright license, be sure to upload it, tag it, and nominate it.

Lacauchie was active starting in 1833. Quite simply, he cannot have lived long enough to still be in copyright. The Wikipedia article List of the verified oldest men tops out at 116; at time of writing, in 2015, even presuming he rivals the oldest known man, that would require him to have started his documented career at age five. And then have stopped his career at age 21. Hence, we can say with much certainty that this is out of copyright.

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